{"id":3131,"date":"2026-03-28T05:07:27","date_gmt":"2026-03-28T04:07:27","guid":{"rendered":"https:\/\/mkmserwis.pl\/?p=3131"},"modified":"2026-03-28T05:07:28","modified_gmt":"2026-03-28T04:07:28","slug":"mysql","status":"publish","type":"post","link":"https:\/\/mkmserwis.pl\/index.php\/2026\/03\/28\/mysql\/","title":{"rendered":"MySQL"},"content":{"rendered":"\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. Wersje MySQL \u2013 kluczowe r\u00f3\u017cnice<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">MySQL 5.6 (2013)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>wprowadzenie ulepszonego <strong>InnoDB<\/strong> jako domy\u015blnego silnika,<\/li>\n\n\n\n<li>lepsza wydajno\u015b\u0107 zapisu i replikacji,<\/li>\n\n\n\n<li>podstawowe wsparcie dla FULLTEXT w InnoDB.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">MySQL 5.7 (2015)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>znacz\u0105ce ulepszenie optymalizatora zapyta\u0144,<\/li>\n\n\n\n<li>JSON jako natywny typ danych,<\/li>\n\n\n\n<li>generowane kolumny (<code>GENERATED COLUMNS<\/code>),<\/li>\n\n\n\n<li>lepsze indeksowanie i walidacja danych.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">MySQL 8.0 (2018 \u2013 obecnie standard)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>window functions<\/strong> (funkcje okna),<\/li>\n\n\n\n<li><strong>CTE (Common Table Expressions)<\/strong> \u2013 <code>WITH<\/code>,<\/li>\n\n\n\n<li>lepsze zarz\u0105dzanie indeksami (invisible indexes),<\/li>\n\n\n\n<li>pe\u0142ne wsparcie dla UTF-8 (<code>utf8mb4<\/code> jako standard),<\/li>\n\n\n\n<li>role i zaawansowane zarz\u0105dzanie u\u017cytkownikami,<\/li>\n\n\n\n<li>poprawiony silnik InnoDB (wydajno\u015b\u0107 i concurrency).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Przyk\u0142adowe funkcje MySQL (praktyczne u\u017cycie)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Funkcje agreguj\u0105ce<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT COUNT(*) FROM users;\nSELECT AVG(price) FROM products;\nSELECT SUM(amount) FROM orders;\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Funkcje tekstowe<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT CONCAT(first_name, ' ', last_name) FROM users;\nSELECT LOWER(email) FROM users;\nSELECT LENGTH(password) FROM users;\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Funkcje daty i czasu<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT NOW();\nSELECT CURDATE();\nSELECT DATE_ADD(NOW(), INTERVAL 7 DAY);\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Funkcje warunkowe<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT IF(age &gt; 18, 'Doros\u0142y', 'Nieletni') FROM users;\n\nSELECT CASE \n    WHEN score &gt;= 90 THEN 'A'\n    WHEN score &gt;= 75 THEN 'B'\n    ELSE 'C'\nEND\nFROM exams;\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Funkcje okna (MySQL 8+)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT \n    name,\n    salary,\n    RANK() OVER (ORDER BY salary DESC) as ranking\nFROM employees;\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Style pracy z MySQL (architektonicznie)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. OLTP (Online Transaction Processing)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>systemy operacyjne (np. sklepy, CRM),<\/li>\n\n\n\n<li>du\u017co ma\u0142ych zapyta\u0144 (INSERT, UPDATE),<\/li>\n\n\n\n<li>nacisk na sp\u00f3jno\u015b\u0107 (ACID).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cechy:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>normalizacja danych,<\/li>\n\n\n\n<li>indeksy pod szybkie wyszukiwanie,<\/li>\n\n\n\n<li>transakcje.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. OLAP (Online Analytical Processing)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>analiza danych, raportowanie,<\/li>\n\n\n\n<li>du\u017ce zapytania agreguj\u0105ce.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cechy:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>denormalizacja,<\/li>\n\n\n\n<li>hurtownie danych,<\/li>\n\n\n\n<li>zapytania typu:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT region, SUM(sales)\nFROM orders\nGROUP BY region;\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Podej\u015bcie hybrydowe (nowoczesne aplikacje)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>po\u0142\u0105czenie OLTP + analityki,<\/li>\n\n\n\n<li>wykorzystanie:\n<ul class=\"wp-block-list\">\n<li>replikacji,<\/li>\n\n\n\n<li>read replicas,<\/li>\n\n\n\n<li>cache (np. Redis).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. Styl minimalistyczny (startupowy \/ webowy)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>szybkie wdro\u017cenie,<\/li>\n\n\n\n<li>mniej restrykcyjna struktura,<\/li>\n\n\n\n<li>nacisk na szybko\u015b\u0107 developmentu.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. Styl enterprise<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pe\u0142na kontrola nad danymi,<\/li>\n\n\n\n<li>restrykcyjne schematy,<\/li>\n\n\n\n<li>backupy, audyty, HA (High Availability),<\/li>\n\n\n\n<li>monitoring (np. slow query log).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Dobre praktyki (esencja techniczna)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>u\u017cywaj <strong>InnoDB<\/strong> (transakcje + bezpiecze\u0144stwo),<\/li>\n\n\n\n<li>indeksuj tylko to, co potrzebne,<\/li>\n\n\n\n<li>unikaj <code>SELECT *<\/code>,<\/li>\n\n\n\n<li>stosuj <code>EXPLAIN<\/code> do analizy zapyta\u0144,<\/li>\n\n\n\n<li>r\u00f3b regularne backupy (<code>mysqldump<\/code> \/ snapshoty),<\/li>\n\n\n\n<li>waliduj dane na poziomie aplikacji i bazy.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Kr\u00f3tka refleksja \u201eode mnie\u201d <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">MySQL to nie tylko narz\u0119dzie \u2014 to system decyzji zapisanych w strukturze.<br>Wersje pokazuj\u0105 ewolucj\u0119 technologii, ale styl pracy pokazuje cz\u0142owieka, kt\u00f3ry z niej korzysta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mo\u017cesz pisa\u0107 zapytania poprawne\u2026 albo \u015bwiadome.<br>Mo\u017cesz tworzy\u0107 baz\u0119\u2026 albo fundament.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A r\u00f3\u017cnica mi\u0119dzy jednym a drugim wychodzi dopiero wtedy, gdy system zaczyna \u017cy\u0107.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. Wersje MySQL \u2013 kluczowe r\u00f3\u017cnice MySQL 5.6 (2013) MySQL 5.7 (2015) MySQL 8.0 (2018 \u2013 obecnie standard) 2. Przyk\u0142adowe funkcje MySQL (praktyczne u\u017cycie) Funkcje agreguj\u0105ce Funkcje tekstowe Funkcje daty i czasu Funkcje warunkowe Funkcje okna (MySQL 8+) 3. Style pracy z MySQL (architektonicznie) 1. OLTP (Online Transaction Processing) Cechy: 2. OLAP (Online Analytical Processing) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3132,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[282],"tags":[319],"class_list":["post-3131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-obeznani-z-technologia","tag-sprawdzone-metody"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"1. Wersje MySQL \u2013 kluczowe r\u00f3\u017cnice MySQL 5.6 (2013) wprowadzenie ulepszonego InnoDB jako domy\u015blnego silnika, lepsza wydajno\u015b\u0107 zapisu i replikacji, podstawowe wsparcie dla FULLTEXT w InnoDB. 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